Heating apparatus



W. S. HADAWAY, JR.

HEATING APPARATUS.

AAPPLICATION FILED AUGJ. 1920.

1,383,1 1o. A Patenuunezs, 1921.

UNITED STATES PATENT OFlF'flCi..

HEATING APPARATUS.

insane.

Specification of Letters Patent.

Patented J une 2S, 1921.

Original application filed November 15, 1919, Serial No. 338,328. Divided and this application filed August '7, 1920. Serial No. 401,898.

To all whom. it may concerns Be it known that l, WILLIAM S. HABA- waY, dr., a citizen of the United States, and a resident of New Rochelle, Westchester county, and State of New York, have invented certain new and useful improvements in Heating Apparatus, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to heating apparatus and has special reference to devices which require large quantities of relatively high temperature heat, such as, for example, japanning ovens or ovens for cooking and bakmg.

In my copending application Serial No. 42984, filed July 3l, 191.5,1 have shown heating apparatus which is adapted to utilize low pressure steam for example, to provide a relatively large quantity of low temperature heat and electricity to supplement the low pressure steam, and to provide a relatively small quantity of high temperaturev heat. The electric energy is utilized to superheat the steam and the temperature of the heat produced by the steam constitutes a working level from which the electric energy operates. v

There are many devices in commercial use which require instead of a large quantity of low temperature heat and a smaller quantity of high temperature heat, a relatively large quantity of high temperature heat. For eX- ample, ordinary ovens for cooking and baking require a temperature of about 400 degrees upward with relatively small fluctua` tions, or adjustments, depending on the nature of the work to he performed. Japanning ovens such as are largely used in commercial manufacturing processes constitute a very good example of apparatus which consumes high temperature heat in large quantities with a relatively small'temperature variation required, say, from 450 to 550 degrees.

If steam or some other relatively inexpensive source of heat is employed for purposes of this kind, as a means forl providing a working level, there is still a very large quantity of heat energ to be supplied provided the working leve of the steam heat 1s about 220 degrees, corresponding to the temperature of saturated steam.

According to my present invention, I'

utilize a combustion steam generator and superheater as a means for elevating the working level to approximately the minimum temperature required of the apparatus, say, for enample, 40() or 450 degrees, and utilize electric energy at the apparatus for regulating and boosting the temperature of the steam which has already been superheated.

One object of my invention is t0 provide a `relatively high temperature heating apparatus adapted to receive a large proportion of the high temperature heat required from an inexpensive source, and to utilize a small proportion of electric energy for boosting and regulating the temperature of the heat thus provided.

Another object is to provide an electric heater adapted to raise the temperature of superheated steam.

Another object is to provide a heating system embodying a steam generator, a superheater associated therewith, heating apparatus adapted to receive the superheated steam from the generator, and electro-responsive means vfor boosting and regulating the temperature of the superheated steam at the heating apparatus.

ther Vohjects of my invention will be set forth hereinafter, and in orderV that my in'- vention may be thoroughly understood, I will now proceed to describe the same in the following specification, and then point out the novel features thereof in appended claims.

Referring to the drawings:

Figure l is a partially diagrammatic View of a heating plant or system showing a steam generator and superheater in sectional elevation, and an oven in sectional plan view which receives its energy partly from the superheated steam and partly from an electric circuit.

Fig. 2 is a sectional elevation of certain parts of the oven which is shown in Fig. 1.

Fig. 3 is a sectional detail of one of the electric heaters for boosting the temperature of the steam shown on a larger scale.

A diagram illustrating the circuit connections for one arrangement of the oven heaters, is shown in Fig. 4.

Like characters of reference designate corresponding parts in all of the figures of the drawings.

10 designates a steam generator of which 1l is the steam drum, l2 water tubes, 13 the Y re pot and 111 the super-heater coil. The steam generated in the steam drum 11 flows through pipe 15 into the superheater coil 14:, and is discharged through a pipe 16 y which is connected to an oven 18.

and 30. The coils 29 are disposed in the insulationV 21 close to the inner shell 2O of the oven, while Vthe coils 30 are `disposed in the insulation close to the outer shell 19 of the oven. The steam after flowing through the coils 29 enters the coils 30 and is finally discharged through outlet pipev 31 toa steam trap which is indicated at 32.

The pipe 16 which conducts the lsuperheated steam from the generator to the oven is thoroughly protected by insulation 33.

Preferably disposed in this insulation are electric conducting wires 34 which may be of sufficiently high resistance to generate heat in the insulation and prevent a drop in temperature from the steam generator to the oven. The conductor for the superheated steam including the electrically heated insulation, may be suitably termedV `.in accordance with 'my copending application Serial No. 67,147,1iled v]1)eceml; er 16, 1915.

l The velectric heaters 23--211 may, of cour a, be formed in any suitable manner, but those shown and described possess many advantages or this service, The structure of Fig. 1 comprises a plurality of resistor tubes 35 within which are wound resistance wires or ribbons 36. The tube itself is formed ot insulating material and a large number of them are employed. They 'are set into slabs such as 37 of some suitable substance like nre-clay, so that the heater when completed,

has a large heat'capacity, and `provides a plurallty of ytapering steam passages in whichv high temperature electric heat is available for raising the temperature of the superheated steam as it passes.

The temperature ofl the steam discharged .into'theoven is Very high and for many classes of work will do no damage, but in case 1t 1s not desired to have the steam come in Contact with the articlesj or substance being heated, or cooked, .an inner vshell or boxto receive such articles or substancesmay be provided. `Such an arrangement 1s shown 1n Fig. 7 of application Serial No. 82,067 liled March Il, 1916, and reiiled as Serial No. 338,328, November 15,

v1919, from which application this case is divided.

he heater units 36 may be connected in series relation as shown in Fig. la or in some other suitable arrangement. 56 indicates an electrical source of energI 57 a heat control switch for connecting the units in series or intwo parallel groups if desired. The heater conductors 34 are con nected to suitable switch postsaud the line conductor 56 `tothe' terminals of ,the same switch.

Various modifications may be effected withinthe spirit and scope of my invention, and I intend that only such limitations be imposed as are indicated inthe appended claims.

What I claim is: y 1. A heating system comprising a steam generator, a combination superheater, a

working member and electro-responsive means for boosting the temperature ofthe steam at the worldngmember. n l

2. A heating system comprising a steam generator, a superheater coil receiving its hea-t from the generator, a working member, means for conducting the superheated steam to the workingmember and for. boosting the temperature of the steam.

3. A heating system comprising a steam generator, a. superheaterV coilv associated therewith, a working member, means for conducting superheated steam to the working member, and an electric heater asso-y ciated with the working member for boosting the temperature of the superheated steam. l Y

4. A heating system comprising a steam generator, a superheater coil associated therewith, a working member, `means :tor conducting the superheated steam to the working member andma-intaining the temperature thereof and! an electric heater at the working member for-boosting and regulating the vtemperature of the superheated .steam at the point of use.

5. A heating system comprising a com bustion steam generator, a superheater coil associated therewith andreceiving its heat `from the generator, a heat chamber, transmission means therein for passing the superheated steam into the Achamber and increasing the temperature thereof as it is admitted. p Y

i 6. A heating system-comprising a steam generator, a `superheater associated Ytherewith, a heating chamber,auxiliary heating means within the chamber arranged :to divide off a vapor compartmentV and to admit .steam from` the vapor-compartment to the chamber, and meansfor conducting steam trom'the superheater to the vapor compartment. u I

7. A heating system comprising a steam generator, a superheater associated therewith, a heating chamber, and an electrically heated body adapted to deliver the steam to 'the chamber whereby the superheated steam is increased in temperature as it is delivered to the chamber.

8, A. heating system comprising a steam Lgenerator, a superheater associated therewith, a heating chamber, and an electrically heated pervious body dividing off a Vapor compartment Within the chamber, adapted to deliver the steam to the chamber Whereby the superheated steam is increased in temperature as it is delivered to the chamber.

9. A heating system comprising a steam generator, a superheater coil associated therewith., a Working member, means for conducting the superheated steam to the working member and maintaining the temperature thereof, an electric heater at the Working member for boosting and regulating the temperature of the superheated steam at the point of use, and means for supplying different desired amounts of electrical energy to said heater.

In `Witness whereof, I have hereunto set my hand this 28th day or' July, 1920.

WILLIAM s. HADAWAY, JR. 

